General Questions and Answers

The freezing point of water H O is 0 00 C at 1 atmosphere A nonvolatile nonelectrolyte that dissolves in water is urea If 11 78 grams of urea CH4N20 60 10 g mol are dissolved in 154 2 grams of water The molality of the solution is freezing point of the solution is m C

Why can free rotation occur easily around a O bond axis but not around a bond axis Select all that apply O Regardless of rotation a 0 bond is effective at overlap but bond cannot overlap if rotated O Regardless of rotation a bond is effective at overlap but a bond cannot overlap if rotated Both o bond and bond are destroyed upon rotation about the bond axis The characteristic side to side overlap of p atomic orbitals that characterizes bonds is destroyed upon rotation about the bond axis

An open end mercury manometer was connected to a flask containing a gas at an unknown pressure The mercury in the a open to the atmosphere was 65 mm higher than the mercury in the arm connected to the flask The atmospheric pressure 748 torr What was the pressure of the gas in the flask in torr

Which of the following reactions would have the most positive AS Value A SO g Na O s Na SO s B CO s CO g C Fe aq SCN aq FeSCN aq D N g 3 H g 2 NH g E 2 NO g Cl g 2 NOCI g

How many grams of a solution that is obtain 18 5 2 sucrose by mass are needed to g of sucrose

What is AG for the reaction CH OH g CO g 2 H g at 25 C AH 90 7 kJ mol AS 221 J mol K 1 4 65767 3 2 5 3 6

sted Lowry acid d Lowry base in Part A H CO3 aq H O 1 H3O aq HCO3 aq H CO3 is the acid proton acceptor H O is the base proton donor O H CO3 is the acid proton donor H O is the base proton acceptor O H O is the acid proton donor H CO3 is the base proton acceptor O H O is the acid proton acceptor H CO3 is the base proton donor Submit Request Answer

What is the pH of a 0 00490 M solution of NaOH

three dimensional structure axial equatorial shape axial axial What is the shape of this molecule Answer Bank equatorial equatorial equatorial 0 RotateX Rotate Y Rotate Z C

Na3PO4 KOH Na OH K3PO4

Predict the products if any that will be formed by the reaction below If n reaction occurs write NR after the reaction arrow Al s HCl aq

The number of particles in 1 mole of hydrogen gas is

What is K for a reaction if AG 237 2 kJ mol at 25 C or 298 K R 8 314 J mol K

CO g H2O g H2 g CO2 g If additional carbon dioxide CO is added to the system then the equilibrium position would not be affected by such a change shift to the right in the direction of products shift to the left in the direction of reactants

The following information is given for aluminum at 1atm AHvap 2467 C 284 kJ mol AHfus 660 C 10 8 kJ mol boiling point 2467 C melting point 660 C specific heat solid 0 900 J g C specific heat liquid 1 09 J g C kJ are required to melt a 49 9 g sample of solid aluminum Al at its normal melting po

118 Describe an example where an open system might result in conclusions that go against the Law of Conservation of Mass 2 pts

2 75g of HCI are mixed with 12 00g of CaCO3 according to the balanced equation shown below Calculate the theoretical yield of CO2 2HCI CaCO3 CaCl2 H O CO O 3 53L O2 99g O 77 7 g

2 An associate broker can do all of the following EXCE a negotiate leases b prepare closing documents c pay commissions d take listings

The first diagram shown here represents liquid water Which of the diagrams that follow best represents the water after it has boiled A B C

X How many grams of AgCl will bo formod whon 60 ml of 0 500 M AgNO is completely reacted according to the balanced chemical reaction FoCl aq 3 AgNO aq 3 AgCl s Fe NO aq

What is the pH of a 0 36 M solution of HNO Ka 4 5 10 2

Construct the molecular orbital diagram for N What is the net bond order in N net bond order i

Question 4 Which of the following would produce an electric current 1 pts Rotating a wire loop between the poles of a horseshoe magnet O Repeatedly moving a wooden rod in and out of the center of a coil of copper wire O Placing the north end of a bar magnet against the south end of a second magnet Question 5

Cl is a stable diatomic molecule It can be decomposed to form two Cl atoms as shown below Cl 2Cl g Predict the change in entropy AS of this reaction Your answer has been submitted Choose Retry to change your answer before your time limit ends Otherwise return to this quiz assignment after the due date to see your grade and question feedback

A sample of air at room temperature 298 15 K in a 4 00 L container holds approximately 0 562 moles of O and 2 11 moles of N along with other trace elements to total 2 67 moles What is the partial pressure of O in the mixture Your answer should have three significant figures Use R 0 08206 L atm mol K Provide your answer below

Which substance exhibits hydrogen bonding A B C D OD B OA CH4 H CH3NH2 CH Cl2

How many moles of precipitate are formed when 25 0 mL of 1 00 M FeCl reacts with 41 5 mL of 1 50 M AgNO in the following chemical reaction Fech aq S AgNO aq 3 AgCl s Fe NO aq

Carry out the following unit conversions 1 26 atm 740 torr 738 torr 1 45 x 10 Pa and i Mi i i torr atm mm Hg torr

Identify each of the following as a strong d weak acid strong base or weak base a Turns pink with the addition of phenolphthalein and completely dissociates into ions b Turns blue litmus paper red and dimly lights up a conductivity meter c Feels slippery and partially dissociates into electrolytes in d aqueous solution Tastes sour and completely dissociates into hydrogen ions in

a b Use this figure to answer the following questions Solubility g per 100 g of water a b 180 160 140 120 100 80 60 40 20 0 10 CsCl 30 NaCH COO SO2 70 Temperature C 50 NaNO3 29 According to saturation curves shown in the figure which of the following solutions is supersaturated 40 g of NaCH3COO in 100 g of water at 40 C 140 g of NaCH3COO in 100 g of water at 80 C 30 Which is least soluble at 10 C CsCl SO RbCl LICI NH CH KCI NaCl Li SO4 90 C 80 g of NaCH3COO in 100 g of water at 40 C d 80 g of NaCH3COO in 200 g of water at 40 C c d NaNO3 Li SO4 31 If 120 g of NaNO3 is dissolved at 50 C the solution would be considered a unsaturated b saturated c supersaturated d none of the above lems Show set up and then units in your answers for full credit 1 A solution contains 85 0 g of NaNO3 and has a volume of 750 mL Find the molarity of the solution m mass of NaCl 58 44 g mol

8 1 point A sample of a compound contains 0 728 g of carbon 0 0911g of hydrogen 0 425 g of nitrogen and 0 487 g of oxygen If the molar mass of the compound is 228 g mole what is the empirical formula of the compound C H3NO C5H8NO C4H6N202 C8H12N404

0 For the reaction 2 Mg 02 2 MgO How many moles of oxygen gas O2 are required to react with 11 40 moles of magnesium Mg 3pts

9 In Utah water rights are obtained through which legal means a prior appropriation b riparian rights c adverse possession d prescriptive rights

13 Refer to the filled in Closing Disclosure If the buyer pays earnest money it will be disclosed where on the Closing Disclosure a Section K b Section L c Page 2

A increases When light passes from air to a more dense material the speed of wave B decreases D does not change Clear is reduced to zero x

If a chemical reaction has a positive AH and a negative AS then A it will be spontaneous at all temperatures B it will be non spontaneous at all temperatures C it will be spontaneous at high temperatures and non spontaneous at low temperatures D it will be spontaneous at low temperatures and non spontaneous at high temperatures E the absolute entropy of the products will be less than 0

If the symbol X represents a central atom Y represents outer atoms and Z represents lone pairs on the central atom he structure Y X Y could be abbreviated as XY Z Classify each molecule according to its shape Linear XY Z Bent 120 Bent 109 Trigonal pyramidal T shaped See saw Square planar Square pyramidal

An aqueous solution is 18 0 by mass ammonia NH3 and has a density of 0 929 g mL The molality of ammonia in the solution is m

You wish to prepare 218 grams of 20 4 FeCl2 You will need grams of iron II chloride and Assume that the density of water is 1 00 g ml mL of water

PCL5 g PCI3 g Cl2 g If some phosphorus pentachloride PC15 is removed from the system then the equilibrium position would not be affected by such a change shift to the right in the direction of products shift to the left in the direction of reactants

1 For the reaction Ca Cl2 CaCl2 How many moles of CaCl2 are produced when 5g of Ca reacts with Cl2 gas 3pts

How many atoms would there be in 22 0 g of C H6 3 53 x 1024 4 44 x 1024 2 83 x 1025 4 44 x 1023

Saturated aqueous hydrogen sulfide has a concentration of 0 10 moldm and a pH of 4 0 Demonstrate whether it is a strong or weak acid

abel these groups of the periodic table Answer Ba alkali metals alkaline earth noble gasa

Melting point C Boiling point C Solubility in water Common use application Ethane 182 8 89 no Making plastic Dimethyl Ether 141 24 yes Heating cooking food replacement for propane in gas Ethan Alcohol 114 1 78 37 y es In alcohol Ethylene Glycol 12 9 197 6 yes Anti freeze coolant SEN 1 A Fill in Table 10 3 You may need to use outside sources to research the answers Which compounds have the same chemical formula What are these called Describe the differences between the structures and properties of those compounds 1 6 Examine Table 10 3 and list the compounds you think have hydrogen bonds Explain why

1 The graph below is a potential energy diagram for the hypothetical reaction A B C D Potential energy kJ 88888898820 60 40 30 Reaction coordinate C D a Is the forward reaction endothermic or exothermic Calculate the value of AH for this reaction b What is the value of the potential energy of the activated complex c Calculate the activation energy EA for the forward reaction d Draw a dashed line to show the effect of adding a catalyst to the system which decreases E by 20

A compound is known to consist of 19 36 carbon 3 25 hydrogen and the rest is oxygen How many grams of this compound will be needed in order to have 23 5 g of oxygen 104 g 53 1 g 30 4 g 80 4 g

NH g HCl g NH Cl s A 5 34 g sample of NH gas and a 5 34 g sample of HCl gas are mixed in a 0 50 L flask at 25 C Identify the limiting reagent OHCI NH Cl ONH How many grams of NH CI will be formed by this reaction mass What is the pressure in atmospheres of the gas remaining in the flask Ignore the volume of solid NH CI produced by the reaction

a Identify three physical prop b Identify one chemical prop

What is AG for the reaction 3 O g 2 O g at 25 C or 298 K if K 6 1 x 10 58 R 8 314 J mol K 3 26 x